following

You hire a pro KD for this . ........ before you decide to block french doors to a deck with an immoveable island.

I don't see where you have any room to extend that island. I would not extend it into what should be a round table breakfast nook area, and I would not block the french doors. Islands need to stay in the kitchen area, they don't expand out to other areas. Extending that island would look very strange, and no, I would not do that. And yes, that would hurt resale. People do odd things for whatever reason and then other people just have to pay to put it back to how it should be.

without seeing the wall opposite the french doors.... you need to think in terms that you are enlarging your kitchen, not just extending the island into the dining room. now it may be that opposite the french doors are more kitchen cabinets and then while the longer island could make traffic patterns difficult, at least it would still all look like kitchen. if there arent cabinets there, well, that would look kind of bad.

also you'll need another pendant, or 2, cant tell.

I agree with keeping the island in the kitchen, not extending, rather than turning it into a continent.

It's hard to give advice without knowing the real dimensions -- distance to that pillar, say. Agree that an island might be more of a traffic block than a table (since you lose the route between the island and table), but it might not be a big deal if you don't use those doors for much of the year.

Why did you get rid of the table? What was good or bad about having it, and what were you hoping you woud get out of the change to a combination island? We're a bit short of information to give really good advice. (Motivation, photos of the missing walls/directions, dimensions...)

I think it would look better if the island extension had a curved end to it (curved towards the patio door), similar to the ones pictured below.

Larchmont Kitchen · More Info

The Woodshop of Avon · More Info

I wouldn't extend it to take up the same amount of space as the table. I think that will make it look out of scale to the kitchen. Plus, as pointed out above, that large an island will interfere with access to the patio door (as acm pointed out, you can walk around both sides of a table but only around one end of an island).

Make sure you allow generous aisles around it, especially between the curved end and the sink counter's corner so that you don't create pinch points. Do you remember enough math from school to calculate diagonal measurements? If not, here's a refresher for you, Pythagoreum theorum.

I'd mock it up, too. Cardboard, plywood or an inexpensive counter height table (try Craigslist) would help you make sure that you like the plan before you spend $$ on a permanent change.I also think consulting a KD would be money well spent.